SU574860A1 - Device for monitoring number of errors in discrete information transmitting channels - Google Patents

Description

one

The invention relates to communication technology and can be used to statistically monitor the number of errors.

A coitrol number and lateral device in the discrete information transmission channels is known, containing an interface unit and serially connected response pulse shaper, a multiplication unit, an impulse weighting noise and a series of interference and interruptions, to the second input of which the output of the threshold unit is connected through a switch, and the comparison unit and indication, to the control input of which the output of the quantizing pulse sequence 1 is connected.

However, the known control device has a low accuracy at periodic and random rectangular sialas, which is caused by edge distortions in the power wave signals.

The aim of the invention is to improve the control accuracy with periodic and random ir-angular signals.

For this, the device for monitoring the number of errors in the channels for transmitting discrete information containing a matching unit and serially connected response pulse shaper, a multiplication unit, a block for extracting a pulse weight sequence of interferences and interruptions to the second input

which is connected to the 5th output of the nor- maly through the switch, and the comparison and indication unit, to the output of which the generator output is connected. Investigator 1; 1 unite and: t} lOB, the Olox transformation and the pulse extraction unit are inputted the output of the matching / cap unit directly and through the selection block

pulses, and the output of the conversion unit is connected to the input of the impulse shaper, to which the output of the unit is connected via a switch.

11a of FIG. 1 shows the structural electric

three scheme of the proposed coitrol device; pas figs. 2 and 3 are time diagrams, but see them; the value of his work.

The coitrol arrangement of the number of directors in the transmission channels of the discrete information contains a unit 1 srcpple, successively connected shaper 2 pmnulses off, a unit 3 multiplication, a unit 4 highlighting immersion weight interference and interruptions, a block 5 srappenp iddikatik, k

the control input of which is connected to a generator 6 of the sequence of quantizing impulses, as well as the threshold unit 7, the output of which is connected to one input of the switch 8, the output of which is connected to the second input of the 4 V1 unit 1 PULSE weighing

3

sequences of interferences and interruptions, pulse extraction unit 9, and transformation unit 10, which can be accomplished, for example, in the form of a series-connected selector 11 of the front of the input signal, element ILM 12, waiting multiplier 13, trigger 14 on the driver 15. Corresponding inputs of the block 10 conversion, for example, the input of the selector 11 of the front of the input signal and the input of the element OR 12, is connected to the output of the foam intermediation unit 1 and through the pulse extraction unit 9, and the output of the unit 10 to the input of the driver 2 clique connected to the output of the unit 1 through the switch interface 8.

The proposed control device operates as follows.

The random rectangular spgnal, distorted by the home chests, enters the conjugation block 1 and from it - at block 9, mm pulses, which regenerates from a random binary rectangular signal a sequence of clock emulsions (Fig. 2.6), which are formed at times of time, corresponding to the boundary m. elementary 1 1 nosokok undistorted by interference of a random telegraph signal.

Clock pulses and pulses from the output of the selector 11 of the fronts of the input signal, distorted by interference, are summed by the element OR 12 (Fig. 2, a), and the output pulses from the element OR 12 are converted by a multivibrator 13 and duration (Fig. 2, d). After the trigger 14 and the output of the driver 15, the signal has the form shown in FIG. 2, d. This is a radiation signal with an amplitude equal to the amplitude of the incident signal.

Work wait1, its multvibragogue) and 13 and thrngger 14 are produced according to certain conditions. These conditions, taking into account the noise immunity criteria of the iremics, reflect the process of signal interaction and interfacing with the formation of the signal.

It is known that the iris parcel is considered erroneous, if at the time of strobirov-1 and izlozlolo perspmenovannaya polarity parcel. As an example in FIG. 2, o and FIG. 2.6 dashed lines of ipokapy points for the lengths and types of monkeys in a random string, as well as modest pulses, which are the impulses of interrogation of the irpemia of irp and making a decision about the luminosity of the received elementary parcel.

In one case, there is a distortion of the type of parcel crushing, and in the other two - marginal distortion. If the type of crushing is distorted, an error is observed. In the second and third cases, it is possible either to form faults or edge distortions, which lead to oigibkam. This depends on the polarity of the transmitted parcels at the time of the interference, which caused changes in the signal, as well as on the power interference. These process4

These are random, so statistical error strings are produced.

The waiting animator 13 and trigger I eliminate the influence of edge distortions, not

causing 1x errors, and also form crushing innules from edge distortions that can cause an error. In the latter case, in the signal (Fig. 2, e), you practically form an impulse, the duration of which characterizes the zone of possible erroneous reception of a particular elementary premise. The transformation of a random rectangular sial in the presence of a distortion of the type of crushing is shown in FIG. 2, d and FIG. 2, c.

At the input of the FM detector, the change in instantaneous signal, the signal has the form shown in FIG. 3, a. The corresponding signal at the detector output is shown in FIG. 3.6. The impact of the interference frequency (Fig. 3, c) leads

The appearance of edge distortion in the signal (Fig. 3, d). However, such interference does not cause errors, since the amplitude of the amplitude of the interference frequency and the duration of the noise is less than the corresponding signal magnitudes. Therefore, the effect of such marginal lesions is excluded. For this, the pulse duration at the output of the waiting multivibrator is set equal to the threshold value, for example:

 1 and - -,

where Ti is the pulse duration of the output

waiting m go in and br a tor; A / - pass receive receiver

filter.

If there are distortions in the sigil that do not exceed the threshold value, only one pulse is formed in the sequence presented on the fng. 2, d, the back front of which is then suppressed by trigger 14 (Fig. 2, d and Fig. 2, d, leftmost position).

At the values of the edge distortions exceeding the threshold loss, two impulses of duration T are formed, which are converted into one crushing pulse by trigger 14 (the second and third cases in Fig. 2, e). The impulse response in the AC signal, caused by such an artisan crushing pulse, will exceed the threshold level C in FIG. 2,. According to the difference in durations of the impulse response values at the threshold level C, the causes causing errors in the random linear angle are differentiated.

Thus, the time zone of an erroneous reception of the sending of a rectangular signal is converted into the corresponding but durable value of the ejection of the envelope of the impulse response at the threshold level. The random noise generation process is independent of the random square wave formation process, so the number of errors in realizations may differ. For example, in this case, two errors are recorded in the time ti and tz. If you shift half of the parcel to the left, then you can fix errors at time points / i and / h. There may be a case when three errors can be fixed in this implementation. Since the processes are random, the average number of errors characterizes the estimation of the general average during the sampling time T.

Thus, in the proposed device, the control accuracy of periodic and random rectangular signals is higher.

Formula 1) 1 3

A device for monitoring the number of errors in the discrete information transmission channels, containing an interface unit and a serially connected shaper of response emulses, a multiplication unit, a pulsed weight sequence selection unit for interruptions and interruptions, to the second input of which the output of the threshold unit is connected through a switch, and compare and display, To the control of its input is connected the output of the generator and the quanthus sequence, their pulses, so that, in order to increase the control accuracy when Periodic and random square-wave signals, the converted block and the pulse extraction block are entered. Thereby, the respective inputs of the transform are connected to the output of the interface unit directly and through the emulsifier extraction unit, and the output of the conversion unit is connected to the input of the response pulse former, to which the output b .-;

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i IcTOMHiiKH information: accepted in the U.N. expertise

1. Copyright sBndetele: your USSR on application .YO 2072890 09. x-. II 04L 11/08, 1974.

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